Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 7. 1976. (Budapest, 1976)
Operculina minima n. sp. (pl. 1, fig. 16) Test small, compressed, thin Its diameter is about 1.8 mm., its thickness is 0.2 mm. There are 4 coils, the number of chambers in the coil is 13. The septa are marked externally by costae and rather fine granules, they are nearly straight. The height of the chambers is much larger than their width; the height/width ratio being 4:1. This species appears in considerable numbers in the upper limestone of the Thebes Formation of Gabal El Shaghab. Remarks: This species Is closely related to O. mariannensis VAUGHAN described from the Eocene beds of Ocala limestone, Florida, in its delicate test and its small number of chambers; it is distinguished from the latter, by its straight septa, fine granules and having no conical tubercle at the center of the test. Operculina dentata n. sp. (pl. 1, figs. 9, 17) Test medium, compressed, its diameter is 3.0 mm and its thickness is 0.3 mm. The test is about the same thickness; surface smooth, composed of 3^ whorls, gradually increasing. The periphery is acute serrated. The last whorl containing 22 chambers. The height of the chamber is larger than their width. The septa are curved convexly outwards. This species is characterized by its serrated periphery. Occurence: This species is found in considerable number in the upper limestone of the Thebes Formation of Gabal El Shaghab. Genus Assilina D' ORBIGNY, 1926 This genus is distinguished from Nummulites by the absence of septal filaments. The whorls may or may not be fully enveloping, but they are closely embracing, that no space is left between them. Owing to the absence in Assilina of septal filaments, the inner whorls and their septa are often clearly distinguishable on the surface of the test. Assilina dandotica DAVIES 1937 (pl. 1, figs. 7, 8; pi. 2, figs. 5, 8) 1937. Assilina dandotica DAVIES P-28, pi. 4, figs. 1-3, 6-8. Test medium, discoid, with subrounded periphery; Its diameter measures 3.0 mm and thickness Is 1.2 mm. The surface is covered with regularly distributed granules, spirally arranged; they are small near the periphery, where they indicate the marginal cord and the septa; but they are coarser over the middle part of the test.
